(Rigging) Character with Spikes on Back: What do I Parent the Spikes to?
Don't add bones to the spikes, but instead, just have the weight the spikes to the max with the corresponding &quot;spine&quot; bone. So for example, take the top two spikes, and weight paint them so they only move with the top back bone before the neck. You'd only need to add bones to the spikes if you intend to move them with the bones that you placed inside them. If they're static, just weight them to whatever back-bone makes sense for the position.
The same goes for other things that protrude/hang off a character. For example, if your character had a backpack, you'd set the weight for the backpack to move with the back bone. If your character had a watch, you'd weight the entire watch to move with the forearm's bone.